R&S
®
CMW 500 GPRF Applications
GPRF Measurements and Generators
Operating Manual 1202.3986.32 – 03 137
The entire sweep can be repeated several times to perform statistical evaluations; see
Statistical Results.
7.1.2.3 Trigger Modes
The "Power" measurement can be performed in "Free Run" (untriggered) mode,
however, an RF power trigger is suitable, in particular if the measurement has to be
synchronized to a sequence of power steps. The R&S CMW 500 provides several
alternative trigger modes for RF input signals with different characteristics.
Trigger Once
The measurement is triggered once; all the following evaluation intervals are calculated
according to the "Step Length" and the "Measurement Length" settings. The trigger is
re-armed only after the measurement is stopped and re-started.
This mode is recommended for signals where all steps (including possible repetitions
for statistics) are within the "Step Length".
Retrigger Sweep
The measurement starts after the first trigger event and continues according to the
"Step Length" and the "Measurement Length" settings until a sweep (a sequence of
power steps) is completed. After the sweep is completed, a new trigger event can re-
synchronize the measurement.
This mode is recommended for signals where all steps within one sweep are within the
"Step Length" but the time gap between the sweeps is not very precise. Furthermore
this mode is recommended for very high statistic counts where re-triggering can
compensate for a possible time drift of the DUT.
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